This 1/2 hertz high selectivity filter was found in the December 1990 issue of Radio Electronics magazine. The source must be symmetrical. The capacitors can be changed for other frequencies.
The transistor in this circuit can be the BC558 and the capacitors must be ceramic. Crystals from...
In the figure we have the basic configuration for interfacing TTL logic with CMOS logic. The...
This circuit includes a battery charging system and an inverter for operating a fluorescent lamp....